Apple WebKit innerHTML element Substitution Remote Code Execution Vulnerability

March 15th, 2010
ZDI-10-029 ZDI-CAN-579

CVE ID

CVE-2010-0047

CVSS Score

10.0 AV:N/AC:L/Au:N/C:C/I:C/A:C

Affected Vendors

Google
Apple

Affected Products

Chrome
Safari
WebKit

Vulnerability Details

This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Apple WebKit. User interaction is required to exploit this vulnerability in that the target must visit a malicious page.

The specific flaw exists in the WebCore's HTMLObjectElement::renderFallBackContent() method. By rewriting an HTML element via the document's innerHTML() method a memory corruption occurs resulting from a call-after-free. This can be leveraged to execute arbitrary code under the context of the current user.

Additional Details

Apple has issued an update to correct this vulnerability. More details can be found at:
http://support.apple.com/kb/HT4070

Disclosure Timeline

  • 2009-10-21 - Vulnerability reported to vendor
  • 2010-03-15 - Coordinated public release of advisory

Credit

wushi of team509

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